[en] For several years, Thales Alenia Space Etca (Belgium) designs and develops modular equipments intended to be embarked on board of spatial vehicles. This concept allows to cover a wide range of spatial applications and to reduce the costs of development and manufacture. During their operating life, these equipments are subjected to severe mechanical vibrations which can produce failures of the electronic and magnetic components which are mounted on the Printed Circuit Boards (PCB). The damages which are the more often observed are the contact losses of electromagnetic relays and the appearance of cracks in the ferrite cores. Thales and the engineering school of Mons (FPMs -- Belgium) collaborate to develop numerical tools allowing the prediction of the vibration levels generated by pyroshocks and the simulation of the dynamic behaviour of embarked equipments to external mechanical vibrations.
